Waves, waves and more waves!

In the voicethread on cos and sin functions, we learned all about properties of this wave-like function. I guess that's yet another way we can relate math to nature and our surroundings! Maybe next time I'm out swimming, I'll think about the amplitude, the period, the frequency and the l.o.o. of the waves about to crash over my head. Hahaa - never know! Hey, I wonder if surfers ever think about the math behind the waves...